/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.explorer.ui.management.processinstance;

import com.vaadin.data.Item;
import com.vaadin.data.Property;
import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.ui.Table;
import org.activiti.explorer.ExplorerApp;
import org.activiti.explorer.data.LazyLoadingContainer;
import org.activiti.explorer.data.LazyLoadingQuery;
import org.activiti.explorer.navigation.DeploymentNavigator;
import org.activiti.explorer.navigation.ProcessInstanceNavigator;
import org.activiti.explorer.navigation.UriFragment;
import org.activiti.explorer.ui.Images;
import org.activiti.explorer.ui.management.ManagementPage;
import org.activiti.explorer.ui.util.ThemeImageColumnGenerator;


/**
 * @author Joram Barrez
 */
public class ProcessInstancePage extends ManagementPage {

    private static final long serialVersionUID = 1L;

    protected LazyLoadingContainer processInstanceContainer;
    protected String processInstanceId;

    public ProcessInstancePage() {
        ExplorerApp.get().setCurrentUriFragment(
                new UriFragment(DeploymentNavigator.DEPLOYMENT_URI_PART));
    }

    public ProcessInstancePage(String processInstanceId) {
        this();
        this.processInstanceId = processInstanceId;
    }

    @Override
    protected void initUi() {
        super.initUi();

        if (processInstanceId == null) {
            selectElement(0);
        } else {
            selectElement(processInstanceContainer.getIndexForObjectId(processInstanceId));
        }
    }

    protected Table createList() {
        final Table table = new Table();

        LazyLoadingQuery query = new ProcessInstanceListQuery();
        processInstanceContainer = new LazyLoadingContainer(query);
        table.setContainerDataSource(processInstanceContainer);

        table.addListener(new Property.ValueChangeListener() {
            private static final long serialVersionUID = 1L;

            public void valueChange(ValueChangeEvent event) {
                Item item = table.getItem(event.getProperty().getValue()); // the value of the property is the itemId of the table entry
                if (item != null) {
                    String processInstanceId = (String) item.getItemProperty("id").getValue();
                    setDetailComponent(new AlfrescoProcessInstanceDetailPanel(processInstanceId, ProcessInstancePage.this));

                    // Update URL
                    ExplorerApp.get().setCurrentUriFragment(
                            new UriFragment(ProcessInstanceNavigator.PROCESS_INSTANCE_URL_PART, processInstanceId));
                } else {
                    // Nothing is selected
                    setDetailComponent(null);
                    ExplorerApp.get().setCurrentUriFragment(new UriFragment(ProcessInstanceNavigator.PROCESS_INSTANCE_URL_PART));
                }
            }
        });

        // Create column headers
        table.addGeneratedColumn("icon", new ThemeImageColumnGenerator(Images.PROCESS_22));
        table.setColumnWidth("icon", 22);

        table.addContainerProperty("name", String.class, null);
        table.setColumnHeaderMode(Table.COLUMN_HEADER_MODE_HIDDEN);

        return table;
    }

}
